{
  "fixture_id": "F-7",
  "scenario": "envelope-write FAIL (disk full/IO error) → stderr-emit.log fallback",
  "input": {
    "task_id": "task-2712-f7",
    "terminal_state": "UNCLASSIFIED_TERMINAL_STATE",
    "exit_code": 1,
    "failure_kind": "disk_full_or_io_error",
    "phase": "write",
    "marker_type": "failure_envelope",
    "simulate_write_fail": true
  },
  "expected": {
    "marker_type": "failure_envelope",
    "marker_suffix": ".failure-envelope.json",
    "done_allowed": false,
    "terminal_state": "UNCLASSIFIED_TERMINAL_STATE",
    "expect_stderr_fallback": true,
    "stderr_emit_log_suffix": ".stderr-emit.log",
    "verify_exactly_one_status": "ZERO_FIRE_BUT_FALLBACK_RECOVERABLE",
    "byte_limit_ok": true,
    "collector_role": "ANU",
    "self_key_used": false
  }
}